My boyfriend slept with another girl, do I break it off?

Anonymous
Me and my boyfriend are in a long-distance relationship. We got together in Turkey, I was with him for two days, so it really wasn't serious. I went back again for a week, so we got a little more serious. Then I had to go to New York for 3 months, I really didn't know how it was gonna work for us, but I really liked him and he wanted us to keep up a serious relationship. I wasn't so sure, so I said I wanted to leave things open, I'm young, I'm still 19 (at the time 18), he's 26. I felt I still wanted to be free and experience more before commiting especially to a long distance relationship, but then we were talking everyday and I started to really feel for him. Eventually we agreed to make it a proper relationship. Now 9 months on, we're both crazy in love, we even talk about marrying, I've been to see him again for 2 weeks and I'm going back again soon. I really trust him, but today, he told me that while I was in New York, he slept with another girl... This was after we'd decided to make it closed. He said he had to be completely honest with me because he couldn't lie to me anymore. Thing is, when I was really drunk one night in NY, a guy who'd been trying it on with me for a few weeks kissed me. He wanted to go further but I stopped him. I felt TERRIBLE about it. And I really mean that, I was on the phone to my mum crying for hours the next day.- Doesn't justify what I did, I know, but it was nothing compared to what I now know he did.

I know that once a cheater, always a cheater thing, but I'm trying to figure out how serious it was what he did. Thinking about it, even under the circumstances, makes me so incredibly angry. believe me if our circumstances had been different it would be over without question. Though I feel like I can really trust this guy, even despite knowing what happened I feel like it wasn't all that bad, considering it was when I was in New York and we weren't that serious... It's all really complicated but I feel so confused. I tried to break up with him today and he said he would never leave me, and that he would die without me. Then he started crying and it killed me, I just thought, am I a complete bitch for doing this when I really don't even want to? I don't think it will happen again, as we are more serious, but I know that if we did get really serious, I will always remember he slept with someone else and it's gonna hurt every time I think about it for at least a few years... I know this was a lot of crap about a couple you don't even know, but please give me your opinion. I feel so confused and I can't believe I'm resorting to this but I need help from someone!
My boyfriend slept with another girl, do I break it off?
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